An expression of great confusion, or bewilderment; A strong demand for answers; An emphasized version of "what is that?"
Used in the same way as "What the Hell?" is used. Variations can be used, e.g. "What in The Nine Hells is that thing?"

Origin: Forgotten Realms lore/terminology (D&D)

"Hey, look at this!"
"WITNH" OR "What in the Nine Hells?"

*Large creature appears*
"What In The Nine Hells is that thing?" OR "WITNH?"